CN1214990A

CN1214990A - Method for making integrally moulded polyolefine shoe intermediate sole

Info

Publication number: CN1214990A
Application number: CN 97121224
Authority: CN
Inventors: 林锦暖
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-10-22
Filing date: 1997-10-22
Publication date: 1999-04-28

Abstract

The production method of EVA integral formed shoe insole is characterized by adding a proper quantity of azo foaming agent and a proper quantity of silane coupling agent in the EVA raw material for making shoe insole, and adopting the processes of uniformly mixing and foam-forming so as to obtain the invented shoe insole. The foaming temp. of all materials can be up to above 140 deg.C, these materials can be easily injected into the forming die, then the die is heated to the foaming temp., then continuously heated to 170 deg.C to make the materials fully foamed, and after the whole shoe insole is expanded, said shoe insole can be taken out from the die. Said invention is simple and easy in production process, can save raw material, and the physical property of the whole shoe insole is uniform and stable.

Description

End method for making in the footwear of integrally moulded polyolefine

The present invention relates to the manufacture method of footwear, more specifically, relate to the method for making at the end in the integrally formed footwear of polyolefin plastics (EVA).

The method for making at the end in the conventional footwear mainly is material with EVA, and the method for its whole manufacturing please cooperate and consult processing procedure sketch shown in Figure 2.In this processing procedure sketch, step 20 is for preparing the material stage, is about to material and packs in the barrel of shaped device; Step 21 is thermoforming stage for the first time, promptly granular raw material is carried out hot-formingly, is about to granular material and carries out the thermoplastic first time and make it slight foaming, carries out the continuous material sheet that roll extrusion forms big plate face; Step 22 is the severing stage, and promptly the continuous material sheet to big plate face carries out the severing processing, it is cut into big bulk material; Step 23 is promptly tailored into the raw material block of suitable size for tailoring the raw material block stage according to big young pathbreaker's bulk shape material at the end in the pre-shoemaking; Step 24 is for cutting formative stage, and this raw material block of soon tailoring in step 23 is inserted in the moulding cutting machine this raw material block is cut and polish and cut moulding, makes it to become to have the blank of the approximate outward appearance at the end in the footwear; Step 25 is hot pressing cold formed the processing stage, soon this blank is inserted and is carried out the cold formed processing of hot pressing in the mould, wherein, this blank is imposed secondary heating pressurization to be reached more than 100 ℃ up to its temperature, because of traditional blowing agent adopts the calcium carbonate class blowing agent of its blowing temperature about 100 ℃ usually, under the temperature more than 100 ℃, the whole material of this blank is able to complete foaming and intumescing and can be full of in the die cavity of mould, thereby constitutes the semi-finished product of the aspect at the end in the footwear; The processing stage that step 26 being deburring, behind foaming, semi-finished product being given depanning and carry out cooling and shaping, by the chipping edger place under repair; At last, the step 27 finished product inspection stage, will be cooled to the semi-finished product of normal temperature through step 26 typing, qualified on inspection, just can finish the finished product at the end in the whole footwear.

And in the processing procedure via the end in the above-mentioned whole footwear, be not difficult to find out that its whole processing procedure is very loaded down with trivial details, extremely long during its whole worker, and all need be dependent on the workman in each processing procedure manually operates, so required operation and control manpower are extremely many, generally need use 28～32 manpowers usually with above-mentioned complete whole processing procedures, especially with the whole hot pressing of the step 25 cold formed establishment stage, for asking the saving equipment cost, be hot-press arrangement and die cost or the like, its used mould is usually in order to once can be molded into that a kind of mould cover at the end in 3～4 pairs of footwear, the productivity ratio of whole manufacturing process is extremely low, the manufacturing time at the end was about 20 minutes in average each footwear, and the fact that subsidiary manufacturing cost can't reduce has some idea of; And more make us in the whole processing procedure perplexing still, the waste material that produces after the grinding in the processing stage of comprising the deburring of step 26, the coefficient of losses of its whole use material is up to more than 60%, and more seriously the waste material of the material after foaming can't recycling, so the environmental pollution that causes can't be eliminated, real is the big disasters of one in the modern efforts at environmental protection, add because of whole one-tenth, the processing of typing, fully by after hot-pressing and foaming, again through cooling and shaping, so through cold, the repetitiousness operation of heat, very uneven on the physical property of the product that is presented, even it is low to form the elasticity tearability, damaged easily situation, thereby be easy to generate defective products, the incidence of general defective products is between 10～20%, the increase of defective products, also make the whole production manufacturing cost high, and with these industrial technology, because its manufacturing technology level is low, so in the face of the inter-industry competition than backward country, naturally form the bottleneck of whole industry upgrading, and how to develop a kind of productivity ratio that makes promote, and can make the manufacture method at the end in the footwear of the new-type EVA that whole waste material and defective products rate reduce, really actively seek the target that changes and research and develop by each manufacturer always.

The inventor in view of the end in the traditional E VA footwear in reality give birth in making face the shortcoming that manpower, cost or the like can't be worked as reduction, be positive research and development, expectation is minimized the manufacturing cost of whole production, quality more can be suitable lifting, to reach the lifting competitiveness, under testing and study concentratedly, can develop end manufacture method in the integrated footwear of a kind of EVA of the present invention eventually.

Therefore, main purpose of the present invention is to provide the manufacture method at the end in the integrated footwear of a kind of EVA.

The manufacture method at the end in the integrated footwear of a kind of EVA provided by the invention, mainly in general EVA shoemaking, add an amount of silicon alkanes coupling agent and azo foaming agent in the raw material at the end, make the temperature increase of foaming, carry out injection-molded moulding production with the EVA material with convenient.Its step comprises: by raw material material and the processing of pulverized particles and the foaming of heating of EVA, typing is handled; It is characterized in that: with the raw material material after cracked, cooperate and add an amount of azo foaming agent and the coupling agent of silicon alkanes, make it be promoted whole material blowing temperature, and fully mix again until mixing, after material crushed taken out grain and handle, energy supply is directly filled in the feed sump of inserting injection (mo(u)lding) machine, feed with injection (mo(u)lding) machine is carried, elder generation makes particulate material be melt into fluid with 85～120 ℃ high temperature, through high-pressure injection in mould, row heats 140～170 ℃ and finishes the bubble typing of haircuting again, reaches with injection moulding and makes the end in the EVA footwear.

The manufacture method at the end in the integrated footwear of a kind of EVA provided by the present invention, in whole footwear, make moulding by injection molding in the manufacture process at the end, the productivity ratio of whole manufacturing process is significantly promoted, and reduce the generation of waste material and defective products, directly reduce whole manufacturing cost, and effectively promote product quality, it is low-quality good to reach basis, has more the practicality of competitive power of product.By increasing an amount of coupling agent and blowing agent in the expanded material, make its temperature of being controlled foaming, made things convenient for by injection-molded moulding, whole manufacturing process is simplified for material, and it is minimum that waste material is dropped to, the many puzzlement points that faced when making in the existing footwear of certain improvement.

For further understanding method of the present invention, feature and practicality thereof below sincerely cooperate the processing procedure sketch to describe the present invention in detail as the back with an embodiment:

Fig. 1 is an end manufacturing process simplified schematic diagram in the footwear of the present invention.

Fig. 2 is an end manufacturing process simplified schematic diagram in the footwear in the conventional method.

End method for making in the integrated footwear of EVA of the present invention, the design of its whole manufacturing process now cooperates processing procedure sketch shown in Figure 1 to be described as follows.Wherein, the raw material that uses of whole designing for manufacturing is roughly worked as with the material faciation of existing EVA.At first the powder material with EVA is presented in the raw material tank, mix step 10 then so that raw material is mixed processing, wherein, be filled into about 2～2.5% azo foaming agent and 1.5～2% silicon alkanes coupling agent, it inserted mix stirring in the groove until even mixing.Carrying out Luntai procedure of processing 11 again handles storing there is mixed material behind the additive be placed into the processing of closing that its raw material is further evenly mixed.Carry out particle treatment step 12 again, make the particle of its raw material be crushed to the particle of suitable size.In step 13, the feed particles after pulverizing is taken out grain through a grit maker of setting the particle diameter thickness, make the particle of whole material have the standardized approx particle diameter of specification, so that heat during injection moulding and the needs of feeding.To pour in the feed sump of injector through the raw material of taking out behind the grain again, in injection (mo(u)lding) machine, supply granular materials with suitable predetermined supply, firing equipment by injection (mo(u)lding) machine internal material-feeding groove, the feed particles material is heated temperature between straight 85～120 ℃, heating process was carried out about 3～5 minutes, make this granular materials fusion form flow-like, be convenient to injection moulding.Injection moulding step 14 is expelled to the material of fusion in the mould, and melted material stream is able in the whole injection molding of filling, again injection molding is heated, make the temperature of this dies cavity reach the effect that can make the blowing agent foaming, thereby make the material in the dies cavity expand up to 140 ℃.Make foaming effectiveness better by being generally, the temperature of entire die inner chamber can be continued to heat reach 170 ℃, it is expanded foamed fully that the material that injects is able to, and cooperate injecting molding die to make the material typing of foaming.After whole foaming process was finished, finished product was able to enrich fully entire die.After this, just carry out the step that die sinking is taken out finished product and checked finished product.

Make the method at the end in the footwear by injection molding mode with the present invention; its the most direct advantage is to produce amount of waste material can drop to minimum level in whole manufacturing process; because the decline of the process of manufacturing; adopt the injection manufacture process; wherein can produce waste material hardly; significantly the material saving cost more advantageously reduces because of producing the environmental pollution that waste material caused and helping environmental protection and handles problems, and the utmost point of can saying so meets the industrialized production of surging modern environmental consciousness.By the injection molding mode of production; the time of its whole processing procedure comprises that material mixes and granulating processing and material melting time thereafter, and the manufacturing time of mold closing and die sinking is about 6 minutes approximately each time; it is compared with traditional method, improves exponentially in productivity ratio.What is more, and in processing procedure of the present invention, it can find out that obviously the personnel that participate in the whole injection manufacture process comprise that its preceding raw material adds the personnel's of allotment etc. number, and it can save over half fully.And on the physical property of the finished product of reality because the allotment of whole raw material evenly, add at dies cavity and once heat injection moulding that whole distribution of material is extremely even, thereby can obtain highly desirable physical property.Owing to adopt molded and shapedly, whole defective products rate is significantly reduced, be the manufacture method at the end in the new-type footwear of utmost point symbol competitiveness in fact.The characteristic of whole finished product relies fully in the temperature of its foaming of control and the design of mould that cooperation has suitable expansion ratio, the manufacturing at the end is reached rapidly and quality is manufactured effect well, cheaply, be one to have end manufacture method in industrial competitiveness and the new-type footwear in fact.

In sum, end method for making in the integrated footwear of EVA of the present invention, it is with the end in the footwear Raw material in the moulding add suitable azo and infusion and the allotment of silicon alkanes coupling agent evenly, Effectively controlling its blowing temperature, namely can once heat injection moulding, make in the whole processing procedure The problem of waste material, procedure for processing and defective products etc. is overcome in the lump, thereby can reach production Make low etc. the advantage of cost cheap, that speed is fast, make production reach economization and richness is competed Striving the purpose of ability, in fact is one to have manufacturing side, the end in the New shoes that industry utilization and exploitation be worth Method is with regard to the industrial utilization value of its tool, the real important document that has met application for a patent for invention.

Claims

1. end manufacture method in the integrated footwear of EVA, described method comprise by the raw material material of EVA and with it and are ground into the processing of particle and the foaming of heating, the fabrication process of typing or the like; It is characterized in that: the raw material material after will pulverizing, cooperate and add an amount of azo foaming agent and the coupling agent of silicon alkanes, to promote the temperature of whole material foaming, fully mix again until mixing, after material crushed has been taken out the grain processing, so that can directly be filled in the feed sump of described injection (mo(u)lding) machine, feed with injection (mo(u)lding) machine is carried, elder generation makes particulate material be melt into the fluid attitude with 85～120 ℃ high temperature, described melted material is expelled in the inner chamber of mould by high-pressure injection, ℃ makes the complete foaming and setting of described material become the end in the EVA footwear mold heated to 140～170 again.

2. manufacture method as claimed in claim 1, the addition that it is characterized in that described azoic foaming agent is between 2～2.5%.

3. manufacture method as claimed in claim 1, the addition that it is characterized in that described silicon alkanes coupling agent is between 1.5～2.0%.

4. manufacture method as claimed in claim 1 is characterized in that a described treatment step of taking out, and can adopt fixing grit maker to take out grain.